Alerts warn you of particular situations in your IT infrastructure. An alert usually indicates the occurrence of an issue that needs to be addressed. The idea behind alerts is that you do not need to look constantly for problematic cases in the system, but it is the system that can detect them and notify you when they happen. There are two types of alerts:
Triggered by conditions that you can specify in the Finder using investigations.
Triggered by warning or error conditions on the real-time services that you add to your Portal.